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IV. Account of feme Species of FoJJil Awmice found in Derby/litre. By 

 Mr. William Marti*, F. L. S. 



Read April 5, 1796. 



AMONG the petrifactions of Derbyfhire, which I have been 

 drawing and defcribing for fome time paft, there appear to- 

 me none more worthy of a careful examination than thofe fofiil 

 fhells, generally referred by authors to the family of Anomia .♦ the 

 variety of form the different fpecies exhibit, and the prodigious 

 quantity of fome of thofe fpecies our limeftone Jlrata afford, mud 

 ilrike even a cafual obferver as curious circumftances, and certainly 

 well deferve the attention of the Naturalift. Though my own re- 

 fearches, in regard to this genus of foffil exuvia^ have been indirect 

 and imperfect, it has chanced that a great variety of fpecimens, 

 within this year or two, has paffed through my hands : among 

 thefe I reckon near thirty diftinct fpecies, feveral of which feem to 

 have efcaped the notice of authors. The Anomia delineated in the 

 annexed tables, is one I fuppofe to be as yet undefcribed. It ap- 

 pears to have been a curious fhell ; its form is very lingular ; and 

 the perforation, which is placed in what is commonly called the upper 

 va/ve, differs from that of every other foffil fpecies I have yet feen 

 in refpect to its fuperior fize, as well as its fituation. 



DESCRIP- 



